/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is MPEG4IP.
 *
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2001.  All Rights Reserved.
 *
 * Contributor(s):
 *      Dave Mackie     dmackie@cisco.com
 */

#include "src/impl.h"

namespace mp4v2
{
    namespace impl
    {

        ///////////////////////////////////////////////////////////////////////////////

        MP4StscAtom::MP4StscAtom(MP4File &file)
            : MP4Atom(file, "stsc")
        {
            AddVersionAndFlags();

            MP4Integer32Property *pCount =
                new MP4Integer32Property(*this, "entryCount");
            AddProperty(pCount);

            MP4TableProperty *pTable = new MP4TableProperty(*this, "entries", pCount);
            AddProperty(pTable);

            pTable->AddProperty(
                new MP4Integer32Property(pTable->GetParentAtom(), "firstChunk"));
            pTable->AddProperty(
                new MP4Integer32Property(pTable->GetParentAtom(), "samplesPerChunk"));
            pTable->AddProperty(
                new MP4Integer32Property(pTable->GetParentAtom(), "sampleDescriptionIndex"));

            // As an optimization we add an implicit property to this table,
            // "firstSample" that corresponds to the first sample of the firstChunk
            MP4Integer32Property *pSample =
                new MP4Integer32Property(*this, "firstSample");
            pSample->SetImplicit();
            pTable->AddProperty(pSample);
        }

        void MP4StscAtom::Read()
        {
            // Read as usual
            MP4Atom::Read();

            // Compute the firstSample values for later use
            uint32_t count =
                ((MP4Integer32Property *)m_pProperties[2])->GetValue();

            MP4Integer32Property *pFirstChunk = (MP4Integer32Property *)
                                                ((MP4TableProperty *)m_pProperties[3])->GetProperty(0);
            MP4Integer32Property *pSamplesPerChunk = (MP4Integer32Property *)
                    ((MP4TableProperty *)m_pProperties[3])->GetProperty(1);
            MP4Integer32Property *pFirstSample = (MP4Integer32Property *)
                                                 ((MP4TableProperty *)m_pProperties[3])->GetProperty(3);

            MP4SampleId sampleId = 1;

            for (uint32_t i = 0; i < count; i++)
            {
                pFirstSample->SetValue(sampleId, i);

                if (i < count - 1)
                {
                    sampleId +=
                        (pFirstChunk->GetValue(i + 1) - pFirstChunk->GetValue(i))
                        * pSamplesPerChunk->GetValue(i);
                }
            }
        }

        ///////////////////////////////////////////////////////////////////////////////

    }
} // namespace mp4v2::impl
